ANALYSER

摘要

A device (1) for analysing the material composition of an object (2) has a casing (3) with a handle (4), an operating trigger (5), a window (6) for abutment against the object to be analysed and a display (7) for displaying the analysis of the object. Mounted in the casing is a housing (11) having a base (12) to which it is pivotally connected about an axis (14) at one end (15). At the other end (16), a stepper motor (17) is provided for traversing the end across the base. This end has an opening (18) generally in alignment with an opening (19) in the housing in which the window is mounted. Within the housing, are mounted: a laser diode (21); a laser amplification crystal (22); a collimating lens (23); a laser focusing lens (24). The components are arranged on a laser projection axis (25), which passes out through the openings (18,19). A plane mirror (32) can receive light emitted by a plasma P excited at the surface of the object (2). Light from the plasma P is reflected in the direction (34) across the projection axis to a curved focusing mirror (35). From this mirror, the light is reflected again across the projection axis and focused on the end of an optical (fibre (37) set in an aperture (38) in the side wall (39) of the housing opposite from the reflecting mirror.

主权项

1. A hand-held device for analysing the material composition of an object via plasma spectrum analysis, the device comprising:
a manually held casing; a laser housing within the casing; a laser within the housing, the laser having a projection axis; openings in the housing and the casing through which a beam from the laser can be projected onto an object to be analysed with the establishment of a plasma at a surface of the object; a first mirror mounted in the housing for receiving plasma emitted light within the openings, via the openings, the mirror being to one side of the projection axis with its normal axis acutely angled to the normal to the projection axis for reflection of the plasma light to the other side of the projection axis; a second, focusing mirror mounted in the housing for receiving the plasma light reflected by the first mirror and reflecting it back again to the first side of the projection axis, the focusing mirror being angled with a central normal axis more acutely angled to the normal to the projection axis than the first mirror; and a receptor for receiving the plasma light from the second mirror and for passing the plasma light to a spectral analyser.